MDF Wheel, 6mm thick fibre board, 74mm and come with drilled centre holes for 4mm dowel, There are also available in 54mm and 74mm or you can order a mix bag
AquaClear 110 Activated Carbon Filter Insert improves water clarity in fresh and saltwater aquariums, for the AquaClear 110 Power Filter, it provides superior adsorption which eliminate odors, discoloration/impuri